If you plan on using the HD icon or the Fednet icon, go to

Montana 5.56 > assets > guis > mods > textures > pd2 > blackmarket > icons > weapons

and replace yayo.texture with the new one

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If you plan on using one of Jimmy's extras, simply drop their "assets" folder into the Montana 5.56 folder.

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HQ Textures

Please note that this might raise a bit of the VRAM Usage and can cause PAYDAY 2 to stutter.
(which happens only for people that are using laptops from past 5 years or even older,
just like myself but it has no problems with that since it has 2GB of VRAM in it. 

PLEASE Install this pack only if you know what you do, if not then leave it and play with what you have!
(possibly the best option for low end laptops would be if you want to avoid implementing this to your game and avoid
these issues that i mentioned above, also you do this at your own risk, installing this on med-high pc's should not cause any
problems related to the performance, also not to mention YOU ARE DOING THIS AT YOUR OWN RISK. Thank you and have fun! -Matthelzor, Groceries and Kitsune Jimmy.)

Instalation:
Drop "assets" folder into the Montana 5.56 folder.